< PrevNext > 32. Facebook Menlo Park, Calif. Share 2017 U.S.-Booked Air Volume: $113 millionGrowing technology giant Facebook—parent of Instagram and WhatsApp, among other platforms—last year increased its spend on U.S.-booked air travel by about 13 percent, according to a BTN estimate. Revenue increased about 47 percent to $40.7 billion; sales and marketing expenditures increased about 25 percent to $4.7 billion. At year-end 2016, the company employed 17,048. That number grew to 25,105 a year later and by the middle of 2018 had reached 30,275. Facebook began to track its travel-related greenhouse gas emissions in 2017, when its carbon dioxide equivalent was 93,800 metric tons. The company in 2016 began to develop a traveler safety program.